I visited (in SF) for the first time a few nights ago and just keep thinking about it!
It's a space for immersive audio. You sit in the center of a room, surrounded by a 32-channel hemispherical speaker array. I heard a mix of Dark Side of the Moon—really amazing.
Conversation
Spiritually quite similar aspirations, as far as I understand! Practically speaking, Envelop's approach (integrating with existing audio production and performance workflows) seems to let it produce a wider range of programming.